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a. MODE selector switch UTM or LATT/ LONG,
depending on coordinate format desired.
b. DISPLAY selector switch DEST-TGT.
c. DEST DISP thumbwheel P.
d. KYBD pushbutton Press when overflying
potential target. Display should freeze.
NOTE
Do not press ENT key while DEST DISP thumbwheel is
at P.
e. If it is desired to store the target, turn DEST
DISP thumbwheel to destination location
desired and press ENT key.
f. If it is not desired to store the target,
momentarily place DISPLAY selector
switch to another position.
e. Transferring Stored Target Coordinates From
One Location to Another. The following procedure
allows the operator to transfer stored target coordinates
from one thumbwheel location to another. For example:
it is assumed that the pilot wants to put the coordinates
of stored target 7 into location of destination 2.
Change 3 3-45
TM 1-1520-238-10
NOTE
Throughout this procedure, range, time-to-go,
bearing, and left/right steering data are computed
and displayed for the destination selected via the
FLY TO DEST thumbwheel.
1. DISPLAY selector switch DEST-TGT.
2. DEST DISP thumbwheel 7.
3. KYBD pushbutton Press.
4. DEST DISP thumbwheel 2.
5. ENT key Press.
f. Transferring Variation From One Location to
Another. The procedure to transfer variation data to the
same location where the associated stored target
coordinates have been transferred is the same as in para
3.14.8.e, except that the DISPLAY selector switch is
placed at SPH-VAR.
g. Dead Reckoning Navigation. As an alternate
BACKUP mode, dead reckoning navigation can be done
using ground speed and track angle estimates provided
by the operator.
1. MODE selector switch BACKUP.
2. DISPLAY selector switch GS-TK.
3. Best estimate of ground speed and track angle -
enter via keyboard.
4. MODE selector switch Set to any other position
to abort procedure.
h. Operation During and After Power Interruption.
During a dc power interruption, the random access
memory (RAM) (stored destination and present position)
data is retained by power from a 9-volt dc dry nicad
battery. This makes it unnecessary to reenter any
navigational data when power returns or before each
flight. If the battery does not retain the stored destination
data during power interruption, the display will indicate an
EN when power returns. This indicates to the pilot that
previously stored data has been lost and present position
(spheroid/variation) and destinations must be entered.
The computer, upon return of power, resets present
position variation to EO 00.0-degree destination, and
associated variations to a non-entered state, and
remembers wind to zero and spheroid to CL6. The
following data must be entered following battery failure:
1. Enter spheroid.
2. Enter present position variation.
3. Enter present position.
4. Enter each destination and its associated
variation.
i. Stopping Procedure.
1. MODE selector switch OFF.
3.15 AN/ASN-137 DNS CONTROLS AND DISPLAYS.
The AN/ASN-137 DNS uses the IP-1552G CDU to
communicate for data entry and display. The CDU (fig 3-
12) has a full alphanumeric keyboard for data entry, 13
special purpose fixed action buttons (FAB), and 8
variable action buttons (VAB). In the non integrated
navigation system only 6 of the FABs are active: NAV,
FDLS, STR, SPC, CLR and FLPN. The CDU display
architecture is organized in page formats. Each page
can display information on 8 separate lines. The bottom
line is always the data entry scratchpad, which is 22
characters wide. The 8 VABs are arranged 4 on each
side of the CDU display. The function performed by the
VAB depends on the particular page displayed. VABs
may be used to transfer data to or from the scratchpad to
a specific location on the display or select another page
to perform other functions. The CDU IP-1552G is
located in the CPG right-hand console. The function of
each is described in table 3-14.
3-46 Change 3
TM 1-1520-238-10
Figure 3-12. CDU IP-1552G, Used with AN/ASN-137 DNS
Table 3-14. AN/ASN-137 Control and Display Functions
Control/Display Function
Display Screen Display formats are organized as pages with 8 display lines; the bottom line is always used as the
scratchpad for entering or editing data.
Keyboard Alphanumeric keyboard is used for entering data.
Left/Right Arrows Move the cursor one space left or right, as appropriate, per keystroke. When pressed constantly,
will move the cursor at about 4 character positions per second.
　
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